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Inbound Email Processing · chunkydotdev | DecimalAI

codingby chunkydotdev

Inbound Email Processing

chunkydotdev/inbound-processing

Source chunkydotdev/email-skills ↗License MIT

Receive, parse, and process incoming email via provider webhooks.

SkillScore86Maintained

Automatic

Coding pack

Last verified 8/6/2026

What it changes

Passed 19 of 22 test cases with the skill, and 15 of 22 without it.

Without skill68%

With skill86%

Checks it passed that the model alone missed

Assigns system prompt mimicry the maximum risk weight of 0.60.
Uses recipient subaddress plus tags parsed into the MailboxHash field.
Extracts SPF, DKIM, and DMARC results from the Authentication-Results header.

and 1 more in the full report

4 fixed15 passed either way3 still failing0 broke

Pass-rate lift: +18 pp
Tokens: +318%
Agent turns: 0%
Response time: -12%

Model gemini-3.6-flashMeasured 8/6/2026v119 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/chunkydotdev-inbound-processing/SKILL.md https://app.decimal.ai/s/chunkydotdev-inbound-processing/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add chunkydotdev-inbound-processing, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/chunkydotdev-inbound-processing/ and pins it in .decimal/skills.lock

decimalai skills add chunkydotdev-inbound-processing

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/chunkydotdev-inbound-processing/SKILL.md https://app.decimal.ai/s/chunkydotdev-inbound-processing/SKILL.md

Raw file: /s/chunkydotdev-inbound-processing/SKILL.md ↗ · machine-readable summary at /s/chunkydotdev-inbound-processing.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

We are implementing a weighted scoring system for prompt injection detection in inbound email text. Which specific attack category carries the highest individual weight (0.60) in the pattern scoring model?

What was checked, without and with the skill
Checked	Without skill	With skill
Assigns system prompt mimicry the maximum risk weight of 0.60.	Missed	Passed

case-18 · gemini-3.6-flash · 8/6/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md596 linessingle file

Inbound Email Processing

Receive incoming email, parse it into structured data, and route it to the right place.

When to use this skill

Setting up inbound email processing for the first time
Choosing between provider inbound features (Postmark, SendGrid, Mailgun, SES)
Parsing MIME messages (multipart bodies, attachments, inline images)
Extracting clean content from HTML email or stripping quoted replies
Building thread detection from email headers (In-Reply-To, References, Message-ID)
Filtering inbound email for spam, phishing, or injection attacks
Designing routing logic for incoming messages (support, billing, leads, etc.)
Handling webhook payloads from email providers

Related skills

domain-authentication - SPF/DKIM/DMARC setup that affects inbound auth verification
reply-classification - classifying reply intent (interested, OOO, objection, etc.)
thread-management - maintaining full conversation context across messages
webhook-processing - general webhook handling patterns (retries, idempotency)
email-security - injection attacks, content sanitization, phishing prevention
bounce-handling - processing delivery failures from outbound sends

How inbound email works

When someone sends an email to your domain, it hits an MX server. You have two options:

Run your own mail server - receive raw SMTP, parse MIME yourself. High control, high maintenance. Almost never worth it for application developers.
Use a provider's inbound feature - the provider receives the email, parses it, and POSTs structured data to your webhook URL. This is what you should do.

The provider handles MX record reception, MIME parsing, spam pre-filtering, and delivers a clean JSON payload to your endpoint. You handle business logic.

Provider inbound features

Postmark

Track record

Benchmark

19 / 22

test cases passed, vs 15 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan14 of 15 checks clean

0 critical · 0 warning · 1 info — scanner v4 — 8/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

No issues (informational notes only).

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

chunkydotdev / email-skills

skills/inbound/inbound-processing/SKILL.md

View on GitHub ↗

License MITImported 8/2/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

chunkydotdev/webhook-processingProcess email delivery webhooks from providers like SendGrid, Postmark, SES, Resend, and Mailgun. Use when building webhook endpoints, handling bounces/complaints/deliveries, debugging missed events, or implementing idempotent event processing.Close match+35 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.